I agree with your thoughts, Selo, definitely. I've...yet to venture into all of
Narutaru, though I have Kitoh-fan friends who have read it, and I have read various chapters of it, so I can see your points.
Spoiler for Bokurano ~Alternative~ ending -- this is the light novel, people!! Don't read unless you don't plan on waiting until the translation's finished.:
In the end of the novel, it comes to the consensus that everyone -- everywhere -- is in a world out there where they are alive, and that means in a way, they are infinite. They can't really die, because their dreams live on somewhere out there. They also imply very heavily that thoughts never really die, as evident that after the narrator - Waku - dies, he is still able to narrate the story and follow the others around. They keep going on, and they keep living.
When I learned this, I truly began to believe that Bokurano is almost uplifting in the end, because the novel was written to tie up loose ends from the anime and manga, as said in an interview by Mihiro Kitoh and Renji Oki, the author of the light novels. It doesn't quite make much sense when I explain it, for I haven't read the chapters yet and have only received details from the girl translating them, but believe me when I say I find the series a lot more...almost happy now, knowing that.
It's still heart-stoppingly depressing, but it doesn't seem as bleak.
Now watch as no one reads my wall-of-text because they don't want anything spoiled for them. XD;